抑制作用的

The formation mechanism of the absolute instability and gyrotron backward wave oscillations is analyzed, and the methods to suppress the parasitical modes are discussed.The nonlinear theory model of gyro-TWT is consummated by considering the influence of tapered magnetic field and waveguide radius, electron velocity spread, and waveguide loss on electron beam-wave interaction. The large-signal characteristic of gyro-TWT, such as launching loss and absolute instability, are also analyzed in detail. This work establishes the foundation for the development of a gyro-TWT amplifier.

重点研究了两段损耗波导结构和损耗陶瓷结构回旋行波管中的电子注-波互作用，分析了绝对不稳定性和回旋返波振荡的形成机制和抑制寄生模式的方法；完善了回旋行波管的非线性理论模型，并考虑了磁场和波导半径渐变、速度零散、波导损耗等因素对注-波互作用的影响；详细分析了发射损耗、相位稳定性等回旋行波管的大信号特征，为回旋行波管放大器的研制奠定了基础。

It is proposed that the appearance of a new kind of mud additive can not represent the formation of a new mud system . The main influence factors of flow resistance at drill bit nozzle are solid content , particle size distribution and hydrophilicity of solid . It is not suitable to use high shear viscosity of both Casson rheology model and determined to predict drilling efficiency .

全面、系统地论述了处理剂和泥浆体系的关系；聚合物的使用浓度应突破全絮凝点，实现低固相应以发挥聚合物的抑制作用为主，絮凝作用为辅；影响钻头水眼处流动阻力的主要因素是泥浆中的固相含量、粒度分布及固相的亲水性，用η_∞代表钻头水眼粘度是欠妥的；聚合物泥浆处理剂的发展主要是开发新的单体和研究新的复配物。

Results showed that TDI induced toxic action on spermatogenic cell,while the chondriosome was its target within the length and concentrations.

结果表明：在本实验染毒时间和染毒剂量范围内，TD I对雄性的生殖毒性主要表现为对各级生精细胞均有一定的毒性作用，作用的靶点是细胞内的线粒体；TD I通过影响各种酶的活性，干扰了睾丸组织的有氧代谢和无氧供能，抑制了细胞对能量的利用，损伤了各级生精细胞，导致生精上皮不可逆的损害，从而造成了其对雄性生殖系统的损伤；TD I对雄性生殖细胞的核酸代谢以及DNA合成有一定影响。

Under the basis of these, the lately widely used wavelet transform in DSP is used to wipe off the noise in the band of the signal frequency. Lastly, for its function of auto noise-resistance and double integral, the triple correlation is also used to improve the sensitivity of the receiver.

在此基础上，为了提高系统在低信噪比下的相关检测能力，采用了近来在信号处理中获得广泛应用的小波变换来去除信号频带内的噪声，并用三重相关对噪声的自动抑制作用和对信号的双重累积作用来提高接收机对回波信号的接收灵敏度。

The strain JCR5 can grow on many substrates other than EE2 such as several steroid estrogens （estrone, 17β-estradiol, estriol and mestranol）, intermediate chemicals in contraceptive medicine processing and some aroma chemicals.

葡萄糖、17β-雌二醇（E2）分别与EE2的共基质代谢试验表明，在共基质条件下，葡萄糖的存在对EE2的降解起到一定的促进作用，而E2的存在对EE2的降解具有一定的抑制作用。

Biological assays for several PAHs containing hydroxy and nitro group indicated that they could protect human red blood cells from hemolysis induced by AAPH and displayed effect of inhibitory for damage of DNA in vitro. They were found to have cytostatic and cytotoxic activity for HL-60 cell lines.

所考察的含有羟基和硝基的多环芳烃化合物对自由基诱导的人血红细胞溶血有一定的抑制作用，对AAPH诱导的DNA损伤有不同程度的保护作用，且它们的抗氧化活性与硝基取代基之间表现出一定的构效关系。

Oncolytic adenovirus H101 could replicate and cause oncolysis effects on glioblastoma U251 cells, it shows greater oncolysis effects and much more H101mRNA expression by enhanced virus tite or prolonged time.

1。溶瘤病毒制剂H101对体外培养的人类胶质母细胞瘤U251存在明显的抑制作用，能够在肿瘤细胞内复制，并最终起到溶瘤作用，并且胶质母细胞瘤U251细胞内病毒的产量随时间的延长而增大。2。

At the same time, we carried on to observe the pathogenic plant disease symptom characteristic in detail. 3. In lab,experimental result expressed that Difenoconazole 10% WP and Propiconazol 25% EC have the highest control effect, wheras Carbendazim 98％ WP and metalaxyl 25% WP almost can not repress development of cotton leaf spot pathogens.

室内药剂筛选试验研究表明，25%丙环唑乳油、10%世高可湿性粉剂对棉花叶斑病致病菌具有很好的抑菌效果，这两种杀菌剂的作用效果普遍高于其它药剂，是较为理想的化学防治药剂；98％多菌灵可湿性粉剂和25%甲霜灵可湿性粉剂，抑菌效果不理想，对病原菌生长的抑制作用普遍不明显。

Results:Osteoblasts has the ability of transmembrane transport of metformin. The transport of metformin could be saturable with time and drug concentration adding;a certain range of temperature and pH can promote the transport of metformin;The transport of metformin was inhibited by cimetidine and phenformin,but promoted by verapamil;Oct1 but no Oct2 was expressed extensively in cell membrane and cytoplasm of osteoblasts;The protein level of Oct1 can be up-regulated by metformin with different drug concentrations and times,but no obvious differentces from each group.

结果：二甲双胍能够在成骨细胞上进行跨膜转运，且随着转运时间和药物浓度的增加而增加，并可达到饱和；一定范围内提高温度和pH值可以促进二甲双胍的转运；西米替丁和苯乙双胍对二甲双胍转运有明显抑制作用，而维拉帕米则对转运有明显的促进作用；Oct1广泛表达在成骨细胞的胞膜及胞浆中，而Oct2无表达；二甲双胍在不同浓度及不同给药时间均能够上调Oct1的表达，但各组间无明显差别。

The maximum MTG activity in the culture broth was 5.04u/mL and increased by 21.8% compared with the control. With the addition of CTAB, pro-MTG was activated to become MTG. CTAB could enhance the production of pro-MTG by relieving the pr...

初步研究表明，CTAB的主要作用是促使谷氨酰胺转胺酶的酶原转化为成熟酶，因此，在发酵过程中添加适当浓度的CTAB，可使酶原快速、完全地转化为成熟的MTG，解除酶原的产物抑制作用，促进了细胞产酶。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。